What phases does buck go through in chapter 6 & 7 after he hears "the call" and runs alone in the woods??

Gradually Buck separates himself from John and spends more and more time in the woods as he immerses himself in the life of the wolf pack. Finally, he is gone from John nearly all the time until John is attacked by the Indians and dies. Once Buck sees that John is gone, he no longer has any reason not to stay in the woods, so he leaves and answers the call of the wild.